Electric lamp



(No Model.)

I M. N. LYNN.

ELECTRIC LAMP.

If i

071330559. I [WE/V1022.

U ITED STATES PATENT Orricn.

O 11 IO POWER AND LIGHT COMPANY, OF DAYTON, OHIO.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 300,095, dated June 10, 188%.

Application filed August 23, 1883.

To all whom it may concern.-

Be it known that I, MIRABEAU N. LYNN, a resident of Indianapolis, Indiana, have made certain new and useful Improvements in Electric Lamps for Locomotive-Engines, a description of which is set forth in the following specification, reference being made to the accompanying drawings, in the several figures of which like letters indicate like parts.

My invention is designed to provide a mechanism balanced in all its parts so as to insure steadiness and secure a clear light from the carbons used in arc lamps, and will be understood from the following explanation.

In the drawings, Figure 1 is a side view of my invention; Fig. 2, a top View; and Fig.'3, a detail side view, enlarged, of the helix and brake mechanism.

In detail, Bis a base supporting a standard, St, connected with which at the top is an axis, Ax, on which are mounted the arms A A and the standard-arm St.A. To the arm A is attached at the outer end the carbon-holder Oh, and near its middle the rack-bar Rb. On its inner end is a counter-balance, 0b.

Mw is a weight that moves on the arm A, provided with rollers r,- and Or is a connecting-rod, attached to the movable weight Mw and the standard-arm St.A by pivots p. The arm A has a counter-balance, Ob at one end, and a'carbon-holder, Oh", at the other, and a rack-bar, Rb", is attached midway. Upon the standard-arm St. Ais fixed a sleeve, upon which are keyed the differential gears 0 and G9 and a face-plate, Fp. Rack-bar Rb meshes with gear-wheel C9 and rack-bar Rb meshes with gear-wheel Cg. An arm, HX.A, projecting from near the base B, supports a helix, H00, provided with a core, Hx.c, Fig. 3; and a standard, Cs, is fastened to the upper part of the helix to support the core tension screws is, which pass through the upper arm of the standard Cs, and a spring, Os, is coiled about the rod in which the core terminates.

s1) and sp are set-plates, and Fr Fr are friction-rollers, which steady the movement of the core in the helix. To the core is attached a brake connecting-rod, be, having a brake-arm pivoted to its upper end, ba, this latter car- (No model.)

rying the brake-rubber b2, and a brake-wheel, b1", the latter adapted to press against the inner and the brake rubber br adapted to press against the outer face of the lace-plate. Upon the axis A00 is mounted a segment-gear, S9, connected by chain 0 to the barrel 131, which contains a spring.

E E are curved electrodes or carbons which are inserted into the holders Oh Ch as shown in Fig. 1. The segment Sg is made integral with the arm A My device operates as follows: The carbons being placed in the holders, a'current is sent through the helix from the dynamo. The core is drawn into the helix by the force of the electric current, and the spring in the barrel Bl, pulling down upon the chain O, draws the arm A upward. This movement by means of rack-bar Rb transmits the motion, through the differential gears Cg Cg and rack-bar Rb, to the arm A, drawing it downward, bringing the carbon-holders together. The gears are relatively sized, so as to bring down the arm A faster than the arm A is moved upward, as the upper carbon consumes faster than the lower, and this arrangement focuses the light at one constant point. The pressure of the spring in the barrel Bl is so graded that it exerts a constant and uniform strain upon the arms A A at any point of their movement. The face plate F1), as before mentioned, is mounted upon the same sleeve with the clifferential gears, and turns in the direction they turn ,actuated by the same force-the spring in the barrel Bl. As the current passes through the helix, it exerts a force to withdraw the core into the helix-that is, it pulls it down against the force of the coiled spring as, which is fastened to the top of the core. As the core is pulled down it pulls down the arm be, the joint K is drawn toward the core, and the brakearm bet drops into such a position that the rubber In grips the periphery of the faceplate, which is moving in the direction of the arrow, Fig. 3, and arrests its motion and reverses its movement, and this force of the current is transmitted through the gears to the arms A A and forces the carbons apart. As the arc lengthens, the current weakens, and

the power of the spring in the barrel BK remaining uniform, now greater than that ol" the current, draws the carbons togeiheragain, and these forces, thus acting and counteracting, insure a medium distance for the carbons and the proper arc. The spring; cs is simply a tension-spring for pullingup the core. The countor-balances 0/) (lb are fixed upon the shorter ends of the arms A A to balance them, so that no concussion or oscillation or movement of the lamp will interfere with the accurate adjllStlllCllt ot the feeding mechanism hercinbefore described.

The movable weight llilu: is allowed a limited movement upon the arm A, to compensate for loss of weight by burning; of the carbons. As the carbons are shortened by coi'isumption, the arms A. A? are brought nearer. and the weight ill-w moves slowly out on the arm A. As the arms separate, the weight Ilia: moves backward nponthcarmi t. Thismovement;ot'theweight Mir is ci'l'ectcd by thecouncctingrtnl Gr, which is pivoted to the arm St. A at a point out ol" line with the center of the axis Axr. These stationary and movable weights eil'ect that complete balancing of the mechanism at all points without which the arc-lamp cannot be used on movinc machinery.

\Vhat I claim, and desire to secure by Lctters latent, the following:

1. In an electric lamp adapted for using; curved carbons, a base sl'ipporting; an axis, upon which are mounted a pair of arms carry ing carlmirliolders, the arms rotatingin opposite directions, and actuated by suitable mechanisni through ditlbreinjial gcarwvhcels mou nted on a sleeve carrying;- a t'ace 'llate, whet-x movement is adapted to be reversed by a brake actuated by a current of electricity passing through a helix provided with a core connected with the brake mechanism, all combined substantially as described.

2. In an electric lamp, the base 13, having vertical and horizontal arms, tliehel ix Ha; with its core Hx. axis A m, arn'is A connterbalanccs 01/ Cl), movable weight Mir, raclebars RI) Rb", and ctnrbon-holders (1/2 (Ii/i", the differential gears .ly (lg/ lace-plate lip, tensiolrspring es, and the brake mechanism connected with the core and o ')eratin;,r upon the face-plate l p, all combined substantially s described.

In an electric lamp, ai'cedinc mechanism operated by a mechanical :l'orcc, which exerts a constant and uniform strain at any their movement upon a pair of arms numnted on a common axis, adapted to rotate in opposite directions nponr-uarh axis, and mrrr vinggthe carbons, the arms provided with suitable stationary weights. and the upper-arm with a mow able weight, so that a balanccis preserved at all times while the lamp is binning, the mcchanical l'orce drawing the arms together, in com bination with suitable mechanism actuated by an electric current for scparati in; the arms and reversing the feeding mechanism at the pro mr point to focus the light at one point, substantially as described.

In witness whereof I have set my hand here to this 10th @213 of ruurust. 1583.

Witnesses:

at l. .l.n:ons, l']. G. \Vnnnnnn.

provided with 

